Table A6.
Non-vanishing quartic energy derivatives Kssst with respect to
and their symmetry relations60
| Symmetry |
 w.r.t. 
|
 |
Group | N |
|---|---|---|---|---|
 |
 |
 |
I, II |  |
 |
I, II |  |
||
 |
 |
 |
I, II |  |
 |
 |
 |
I, II |  |
 |
 |
 |
I, II |  |
 |
 |
 |
II |  |
 |
II |  |
||
 |
 |
 |
II |  |
 |
 |
 |
II |  |
 |
 |
 |
II |  |
ci is the subscript labelling the degenerate representation of mode i, for example ci = 1 for E or E1, ci = 2 for E2, etc. p is a non zero integer number and N indicates the order of the principal symmetry axis. For I and II Group classification see Table A1.